Albert Barnes Commentary Leviticus 23:36

"Seven days ye shall offer an offering made by fire unto Jehovah: on the eighth day shall be a holy convocation unto you; and ye shall offer an offering made by fire unto Jehovah: it is a solemn assembly; ye shall do no servile work." — Leviticus 23:36 (ASV)

An offering made by fire - See Leviticus 23:8. The succession of sacrifices prescribed in Numbers 29:12-38, which forms such a marked feature in the Feast of Tabernacles, tends to show the distinctness of the “solemn assembly” from the festal week.